Cutter-head.



Patented lune l2, I900.

No. 65l,728.

S. J. SHIMER. BUTTER HEAD. (Application filed Apr. 18, 1900.)

2 Sheets-Sheet I.

(No Model.)

' Pafm g ted lune l2, I900.

8. J. SHIRE-R.

CUTTER HEAD;

(Application filed. Apr 18; LQOO.)

2 Sheets-Sheet 2.

(No mm.)

344v anion FNITED STATES PATENT Genres.

SAMUEL J. SHIMER, OF MILTON, PENNSYLVANIA.

CUTTER-HEAD.

SPECIFICATION forming part of Letters Patent No. 651,728, dated June 12, 1900.

Application filed April 13; 1900- S'i'izil No. 123703.. (No model.)

To all whom it stay concern:

Be it known that I, SAMUEL J. SHIMER, a citizen of the United States,residing at Milton, in the county of Northumberland andStat-e of Pennsylvania, have invented new and useful Improvements in Cutter-Head's, of which the following is a specification.

My present invention relates to cutterheads; and the object of the same is to provide a cutter-head with bit-seats arranged alternately in pairs upon the upper and lower sides of each quarter-section of the head and to locate one of each pair of seats farther from the center of the head than the other in order that the greatest possible difference may be attained between the surface cut of one bit and the extreme cut of the other bit and at the same time to attain this result with bits of the smallest relative diameters. This object is attained by means of the construction shown in the accompanying drawings,

which form a part of this specification, and in which Figure l is a perspective view of a cutterhead made in accordance with my invention. Fig. 2 is a bottom plan view of the same. Figs. 3 and 3 are plan views of the two sections of the expansible head separated. Fig. 4 is a perspective view of one of the cutters. Fig. 5 is a similar View of the companion cutter.

Like letters and numerals of reference designate like parts wherever they occur in the different views.

In the drawings the numeral 1 designates the upper section of the cutter-head, and 2 the lower section of the same. On each section of the head twopairs of bit-seats are formed, one of each pair being of larger diameter than the other. The seats of the 13 -0111; rlig vnntov awn rinsidngi'nfl in the nu.

from the center or axis of the head to cut a comparatively-deep groove, while its companion bit, like 8, will cut a surface at the side of the groove at a greater relative distance from the bottom of the groove than could result were the two companion bits set concentric with the axis and the same relative size maintained. This feature is of considerable importance, as it increases the scope of the cutters, and while I have shown bits of a certain type for cutting a central groove and two opposite mold-surfaces it will be obvious that this feature maybe applied to out ters of widely-different contours.

It will be observed that by setting the two sections of the cutter-head eccentrically sufficient space is given to free the notch in the bit 8 to facilitate the sharpening of its outtingedge. It will also be noted that in order to maintain a proper running balance the two companion bits must be located within each quarter-section of the circumference of the head, either upon the one and the same center or side by side, as shown. When located side by side, the differential bit-centers figure as important factors byway of keeping the bit-seat diameters of the two hits as small as possible in order that they may be located within the limited space afforded by each quarter-section of the head and each pair of bit-seats opposite each other pair to properly maintain a true running balance. The bolt holes 10 for the bits 7 are located nearer to the edges of the flanges 5 and 6 than the bolt holes 11 for the bits 8, and this arrangement also gives some differential scope to each pair of bits.

Having thus fully described what I claim is-" 1 A nutter-head having circular hit-seats my invention,

meral 3, and those of the smaller diameter are designatedby the numeral 4:. The two sections 1 and 2 of the head are relatively expansible, and the flanges 5 and 60f these sec tions are eccentric-that is to say, the distance from the point a to the axial center X of the head is greater than the distance from point I) to said axial center. The result of this construction is that even with a bit of comparatively small diameter, like 7, the cutting edge will extend a sufficient distance arranged in pairs, each pair occupying a quarter-section of the circumference of the cutterther from the center of the head than its com I panion, substantially as described.

3. A cutter-head consisting of two expan sibie sections, each provided with eccentric flanges, bit-seats located on said flanges in each quarter-section of the head, said bitseats being arranged in pairs, one seat in each pair being located at a greater distance from the axis of the cutter-head than its companio'n, and bits securedbybolts in said seats, [6

v substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses. 1 p

I SAMUEL J. SHIMER. Witnesses:

W. H. BECK, H. A. KERR. 

